ffmpeg encoder error: cannot find encoder MPEG Audio layer 3

[$p00ky]

Hi !

I have a problem with an audio transcoding in mp3 or mp4a.

I want to start a server which broadcast my webcam through a multicast network, but I cannot use the mp3 format for audio coding.

Here is my command line :

vlc -vvv v4l:// :v4l-vdev="/dev/video0" :v4l-adev="/dev/dsp" [...] --sout '#transcode{vcodec=mp4v,acodec=mp3,vb=2048,ab=128,vt=800000,keyint=80,deinterlace}:std{access=rtp,mux=ts,dst=224.1.2.3:6000,sap,name="TestStream"}' --ttl 12 -I rc

And the output error is :

[00000301] stream_out_transcode private debug: creating audio transcoding from fcc=`s16l' to fcc=`mp3 '
[00000369] main decoder debug: looking for decoder module: 25 candidates
[00000369] araw decoder debug: samplerate:44100Hz channels:2 bits/sample:16
[00000369] main decoder debug: using decoder module "araw"
[00000370] main encoder debug: looking for encoder module: 8 candidates
[00000370] ffmpeg encoder debug: libavcodec already initialized
[00000370] ffmpeg encoder error: cannot find encoder MPEG Audio layer 1/2/3
[00000301] stream_out_transcode private error: cannot find encoder ((null))
[00000369] main decoder debug: removing module "araw"
[00000301] stream_out_transcode private error: cannot create audio chain
[00000326] main packetizer error: cannot create packetizer output (s16l)

I have the same problem with mp4a :

ffmpeg encoder error: cannot find encoder MPEG AAC Audio

But it works perfectly with the mpga audio coding.

What I don't understand is that my ffmpeg encoder is compiled with mp3 encoding (with lame) and aac encoding (faac).

Here is my ffmpeg -format :

Code: Select all

thomas@thomas-asusf3:~/stage$ ffmpeg -formats FFmpeg version SVN-r14255, Copyright (c) 2000-2008 Fabrice Bellard, et al. configuration: --enable-gpl --enable-postproc --enable-pthreads --enable-liba52 --enable-liba52bin --enable-libdc1394 --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid libavutil version: 49.7.0 libavcodec version: 51.60.0 libavformat version: 52.17.0 libavdevice version: 52.0.0 built on Jul 16 2008 14:11:02, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu7) DE mp3 MPEG audio layer 3 EA libmp3lame libmp3lame MP3 (MPEG audio layer 3) D A mp3 MP3 (MPEG audio layer 3) D A mp3adu ADU (Application Data Unit) MP3 (MPEG audio layer 3) D A mp3on4 MP3onMP4 D aac ADTS AAC EA libfaac libfaac AAC (Advanced Audio Codec) D A mpeg4aac libfaad AAC (Advanced Audio Codec) text2movsub remove_extra noise mov2textsub mp3decomp mp3comp mjpegadump imxdump h264_mp4toannexb dump_extra

Why does VLC say that the ffmpeg encoder has no mp3 or mp4a encoding ?

And how can I fix it ?


Thanks in advance !

[Jean-Baptiste Kempf]

See the people who compiled your VLC.

[$p00ky]

Whether it be from apt-get install or from my own compilation using this configure :

Code: Select all

./configure --enable-debug --enable-shout --enable-live555 --enable-dc1394 --enable-dv --enable-dvdread --enable-dvb --enable-faad --enable-twolame --enable-real --enable-realrtsp --enable-flac --enable-tremor --enable-theora --enable-dirac --enable-svg --enable-snapshot --enable-qte --enable-svga --enable-directfb --enable-ggi --enable-glide --enable-aa --enable-caca --enable-esd --enable-portaudio --enable-arts --enable-alsa --enable-jack --enable-upnp --enable-wxwidgets --enable-ncurses --enable-xosd --enable-galaktos --enable-lirc --enable-mozilla --enable-mediacontrol-python-bindings --enable-java-bindings --enable-testsuite --with-ffmpeg-mp3lame --with-ffmpeg-faac --with-ffmpeg-dts --with-ffmpeg-dca --with-ffmpeg-vorbis --with-ffmpeg-theora --with-ffmpeg-ogg --with-ffmpeg-zlib

The problem is the same.

[Jean-Baptiste Kempf]

Well, your debian's ffmpeg doesn't have mp3 encoder enabled.

[$p00ky]

It has :

--with-ffmpeg-mp3lame

ffmpeg -formats
FFmpeg version SVN-r14255, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --enable-gpl --enable-postproc --enable-pthreads --enable-liba52 --enable-liba52bin --enable-libdc1394 --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libschroedinger --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
libavutil version: 49.7.0
libavcodec version: 51.60.0
libavformat version: 52.17.0
libavdevice version: 52.0.0
built on Jul 16 2008 14:11:02, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu7)
DE mp3 MPEG audio layer 3
EA libmp3lame libmp3lame MP3 (MPEG audio layer 3)
D A mp3 MP3 (MPEG audio layer 3)
D A mp3adu ADU (Application Data Unit) MP3 (MPEG audio layer 3)
D A mp3on4 MP3onMP4
D aac ADTS AAC
EA libfaac libfaac AAC (Advanced Audio Codec)
D A mpeg4aac libfaad AAC (Advanced Audio Codec)

And it also has the AAC Encoder...



Edit: Actually, the "handmade" compiled version of VLC doesn't work at all :

[00000001] main private warning: cannot load module `/usr/local/lib/vlc/codec/libtremor_plugin.so' (/usr/local/lib/vlc/codec/libtremor_plugin.so: undefined symbol: vorbis_synthesis_read)
[00000001] main private warning: cannot load module `/usr/local/lib/vlc/codec/libffmpeg_plugin.so' (/usr/local/lib/vlc/codec/libffmpeg_plugin.so: undefined symbol: nut_seek)
[00000001] main private warning: cannot load module `/usr/local/lib/vlc/stream_out/libstream_out_switcher_plugin.so' (/usr/local/lib/vlc/stream_out/libstream_out_switcher_plugin.so: undefined symbol: faacEncClose)

So because of this error, it couldn't build the video nor audio chain :

[00000302] stream_out_transcode private debug: creating video transcoding from fcc=`RV24' to fcc=`mp4v'
[00000301] main stream output debug: adding a new input
[00000313] main decoder debug: looking for decoder module: 25 candidates
[00000313] main decoder debug: using decoder module "rawvideo"
[00000314] main encoder debug: looking for encoder module: 8 candidates
[00000302] stream_out_transcode private error: cannot find encoder ((null))
[00000313] main decoder debug: removing module "rawvideo"
[00000302] stream_out_transcode private error: cannot create video chain

But with the "automatic installation" through apt-get install, it works for the video, but not for the audio.
Maybe the "automatic installed" version doesn't have --with-ffmpeg-mp3lame ? How can I check it ?